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Hadoop学习：MapReduce不使用Reduce将表合并提高效率

一、✌题目要求record表：ID城市编号空气指数001032450020265500305743004042460050295600601637007058310080368300902349city表：城市编号城市名称01长沙02株洲03湘潭04怀化05岳阳目标表：ID城市名称空气指数001湘潭...

一脸懵逼学习MapReduce的原理和编程（Map局部处理，Reduce汇总）和MapReduce几种运行方式

1：MapReduce的概述：　　（1）：MapReduce是一种分布式计算模型，由Google提出，主要用于搜索领域，解决海量数据的计算问题.　　（2）：MapReduce由两个阶段组成：Map和Reduce，用户只需要实现map()和reduce()两个函数，即可实现分布式计算，非常简单。　　...

Hadoop 分布式计算框架 MapReduce

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开源大数据平台 E-MapReduce

开源大数据平台 E-MapReduce（简称“EMR”）是云原生开源大数据平台，向客户提供简单易集成的Hadoop、Hive、Spark、Flink、Presto、ClickHouse、StarRocks、Delta、Hudi等开源大数据计算和存储引擎服务。

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